What do they reveal?

The documents show the myriad ways in which the rich can exploit secretive offshore tax regimes. Twelve national leaders are among 143 politicians, their families and close associates from around the world known to have been using offshore tax havens.

A $2bn trail leads all the way to Vladimir Putin. The Russian president’s best friend – a cellist called Sergei Roldugin – is at the centre of a scheme in which money from Russian state banks is hidden offshore. Some of it ends up in a ski resort where in 2013 Putin’s daughter Katerina got married.

What is Mossack Fonseca?

It is a Panama-based law firm whose services include incorporating companies in offshore jurisdictions such as the British Virgin Islands. It administers offshore firms for a yearly fee. Other services include wealth management.

Where is it based?

The firm is Panamanian but runs a worldwide operation. Its website boasts of a global network with 600 people working in 42 countries. It has franchises around the world, where separately owned affiliates sign up new customers and have exclusive rights to use its brand. Mossack Fonseca operates in tax havensincluding Switzerland, Cyprus and the British Virgin Islands, and in the British crown dependencies Guernsey, Jersey and the Isle of Man.